42861931 has 4 divisors (see below), whose sum is σ = 48985072. Its totient is φ = 36738792.

The previous prime is 42861911. The next prime is 42861941. The reversal of 42861931 is 13916824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42861931 - 2²³ = 34473323 is a prime.

It is a super-2 number, since 2×42861931² = 3674290258097522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42861911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3061560 + ... + 3061573.

It is an arithmetic number, because the mean of its divisors is an integer number (12246268).

Almost surely, 2^42861931 is an apocalyptic number.

42861931 is a deficient number, since it is larger than the sum of its proper divisors (6123141).

42861931 is an equidigital number, since it uses as much as digits as its factorization.

42861931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6123140.

The product of its digits is 10368, while the sum is 34.

The square root of 42861931 is about 6546.9023973174. The cubic root of 42861931 is about 349.9644344813.

The spelling of 42861931 in words is "forty-two million, eight hundred sixty-one thousand, nine hundred thirty-one".